<div [formGroup]="parts" class="example-tel-input-container">
  <input class="example-tel-input-element" formControlName="area" size="3" aria-label="Area code" (input)="_handleInput()">
  <span class="example-tel-input-spacer">&ndash;</span>
  <input class="example-tel-input-element" formControlName="exchange" size="3" aria-label="Exchange code" (input)="_handleInput()">
  <span class="example-tel-input-spacer">&ndash;</span>
  <input class="example-tel-input-element" formControlName="subscriber" size="4" aria-label="Subscriber number" (input)="_handleInput()">
</div>
